Hitachi DV10DA User manual

1
INSTRUCTION MANUAL
AND
SAFETY INSTRUCTIONS
FOR
CORDLESS HAMMER DRILL
MODEL DV10DA • DV 10DV
Variable speed
DV10DA
Two speed
WARNING:
Improper and unsafe use of this power tool can result in
death or serious bodily injury!
This manual contains important information about product
safety. Please read and understand this manual before
operating the power tool. Please keep this manual available
for others before they use the power tool.

2
—CONTENTS —
Page
IMPORTANT INFORMATION .................................................................................... 3
MEANINGS OF SIGNAL WORDS ............................................................................. 3
SAFETY
IMPORTANT SAFETY INSTRUCTIONS
FOR USING ALL POWER TOOLS .................................................................. 4
IMPORTANT SAFETY INSTRUCTIONS
FOR USE OF THE CORDLESS HAMMER DRILL ........................................... 7
IMPORTANT SAFETY INSTRUCTIONS
FOR BATTERY CHARGER .............................................................................. 7
IMPORTANT SAFETY INSTRUCTIONS
FOR USE OF THE BATTERY AND BATTERY CHARGER ............................. 8
DISPOSAL OF THE EXHAUSTED BATTERY ....................................................... 9
OPERATION AND MAINTENANCE
MODEL .................................................................................................................. 10
NAME OF PARTS .................................................................................................. 10
SPECIFICATIONS .................................................................................................. 11
ACCESSORIES ...................................................................................................... 12
STANDARD ACCESSORIES .......................................................................... 12
OPTIONAL ACCESSORIES ............................................................................ 12
APPLICATIONS ..................................................................................................... 13
REMOVAL AND INSTALLATION METHOD OF BATTERY ................................. 13
CHARGING METHOD ........................................................................................... 14
BEFORE USE ......................................................................................................... 17
OPERATION .......................................................................................................... 19
MAINTENANCE AND INSPECTION ..................................................................... 20
STORAGE .............................................................................................................. 21
SERVICE AND REPAIRS ....................................................................................... 21
PARTS LIST ........................................................................................................... 22

3
IMPORTANT INFORMATION
Read and understand all of the operating instructions, safety precautions and warnings in
the Instruction Manual before operating or maintaining this power tool.
Most accidents that result from power tool operation and maintenance are caused by the
failure to observe basic safety rules or precautions. An accident can often be avoided by
recognizing a potentially hazardous situation before it occurs, and by observing appropriate
safety procedures.
Basic safety precautions are outlined in the “SAFETY” section of this Instruction Manual and
in the sections which contain the operation and maintenance instructions.
Hazards that must be avoided to prevent bodily injury or machine damage are identified by
WARNINGS on the power tool and in this Instruction Manual.
Never use this power tool in a manner that has not been specifically recommended by
HITACHI, unless you first confirm that the planned use will be safe for you and others.
The warranty of this power tool is separately packed. Before using this power tool, make sure
to thoroughly read and understand the content of the warranty.
MEANINGS OF SIGNAL WORDS
WARNING indicates a potentially hazardous situations which, if ignored, could result in
serious personal injury.
CAUTION indicates a hazardous situations which, if ignored, could result in moderate
personal injury, or could cause machine damage.
NOTE emphasizes essential information.

4
SAFETY
IMPORTANT SAFETY INSTRUCTIONS FOR USING ALL POWER
TOOLS
WARNING: Death or serious bodily injury could result from improper or unsafe use
of power tools. To avoid these risks, follow these basic safety instruc-
tions:
READ ALL INSTRUCTIONS
1. NEVER TOUCH MOVING PARTS.
Never place your hands, fingers or other body parts near the tool’s moving parts.
2. NEVER OPERATE WITHOUT ALL GUARDS IN PLACE.
Never operate this tool without all guards or safety features in place and in proper
working order. If maintenance or servicing requires the removal of a guard or safety
feature, be sure to replace the guard or safety feature before resuming operation of the
tool.
3. ALWAYS WEAR EYE AND EAR PROTECTION.
Protect yourself from flying or expelled wood chips, metal particles or other debris by
using safety goggles or equivalent eye protection. Wear ear protection to protect
yourself from excessive noise.
4. AVOID UNINTENTIONAL STARTING.
Don’t carry the tool with your finger near the power switch.
5. STORE TOOL PROPERLY.
When not in use, the tool should be stored in a dry place. Keep out of reach of children.
Lock-out the storage area.
6. KEEP WORK AREA CLEAN.
Cluttered areas and benches invite injuries.
Clear all work areas and work benches of unnecessary tools, debris, furniture, etc.
7. CONSIDER WORK AREA ENVIRONMENT.
Don’t expose power tools to rain.
Don’t use power tools in damp or wet locations.
Keep work area well lit and well ventilated.
Don’t use tool in presence of flammable liquids or gases.
Power tools produce sparks during operation. They also spark when switching ON/
OFF. Never use power tools in sites containing lacquer, paint, benzine, thinner,
gasoline, gases, adhesive agents, and other materials which are combustible or
explosive.

5
8. KEEP CHILDREN AWAY.
Do not let visitors contact tool.
All visitors should be kept safely away from work area.
9. DON’T FORCE TOOL.
It will do the job better and safer at the rate for which it was intended.
10. USE RIGHT TOOL.
Don’t force small tool or attachment to do the job of a heavy-duty tool.
Don’t use tool for purpose not intended-for example-don’t use circular saw for cutting
tree limbs or logs.
11. DRESS PROPERLY.
Do not wear loose clothing or jewelry.
They can be caught in moving parts. Rubber gloves and non-skid footwear are
recommended when working outdoors.
Wear protective hair covering to contain long hair.
12. USE FACE OR DUST MAKE IF OPERATION IS DUSTY.
13. SECURE WORK.
Use clamps or a vise to hold work. It’s safer than using your hand and it frees both
hands to operate tool.
14. DON’T OVERREACH.
Keep proper footing and balance at all times.
15. MAINTAIN TOOLS WITH CARE.
Keep tools sharp and clean for better and safer performance.
Follow instructions for lubricating and changing accessories.
Keep handles dry, clean, and free from oil and grease.
16. REMOVE ADJUSTING KEYS AND WRENCHES.
Keys and adjusting wrenches remove from tool before turning it on.
17. STAY ALERT.
Watch what you are doing. Use common sense. Do not operate tool when you are tired.
Tools should never be used by you if you are under the influence of alcohol, drugs or
medication that makes you drowsy.
18. CHECK DAMAGED PARTS.
Before further use of the tool, a guard or other part that is damaged should be carefully
checked to determine that it will operate properly and perform its intended function.
Check for alignment of moving parts, binding of moving parts, breakage of parts,
mounting, and any other conditions that may affect its operation. A guard or other part
that is damaged should be properly repaired or replaced by an authorized service
center unless otherwise indicated elsewhere in this Instruction Manual.
Have defective switches replaced by authorized service center.
Do not use tool if switch does not turn it on and off.
19. NEVER USE A POWER TOOL FOR APPLICATIONS OTHER THAN THOSE SPECIFIED.
Never use a power tool for applications other than those specified in the Instruction
Manual.

6
20. HANDLE TOOL CORRECTLY.
Operate the tool according to the instructions provided herein. Do not drop or throw
the tool. Never allow the tool to be operated by children, individuals unfamiliar with
its operation or unauthorized personnel.
21. CHECK FOR LIVE WIRES.
Avoid the risk of severe electrical shock by checking for live electrical wires that may
be hidden by walls, floors or ceilings. The wires should be de-energized before work
begins.
22. KEEP ALL SCREWS, BOLTS AND COVERS TIGHTLY IN PLACE.
Keep all screws, bolts, and plates tightly mounted. Check their condition periodically.
23. DO NOT USE POWER TOOLS IF THE PLASTIC HOUSING OR HANDLE ARE CRACKED.
Cracks in the tool’s housing or handle can lead to electric shock.
Such tools should not be used until repaired.
24. BLADES AND ACCESSORIES MUST BE SECURELY MOUNTED TO THE TOOL
Prevent potential injuries to yourself or others. Blades, cutting implements and
accessories which have been mounted to the tool should be secure and tight.
25. NEVER USE A TOOL WHICH IS DEFECTIVE OR OPERATING ABNORMALLY.
If the tool appears to be operating unusually, making strange noises, or otherwise
appears defective, stop using it immediately and arrange for repairs by an authorized
Hitachi service center.
26. CAREFULLY HANDLE POWER TOOLS.
Should a power tool be dropped or struck against hard materials inadvertently it may
be deformed, cracked, or damaged.
27. DO NOT WIPE PLASTIC PARTS WITH SOLVENT.
Solvents such as gasoline, thinner, benzine, carbon tetrachloride, and alcohol may
damage and crack plastic parts. Do not wipe them with such solvents. Wipe plastic
parts with a soft cloth lightly dampened with soapy water.
28. USE ONLY AUTHENTIC HITACHI REPLACEMENT PARTS.
Replacement parts not manufactured by Hitachi may void your warranty and can lead
to malfunction and resulting injuries. Authentic Hitachi parts are available from your
dealer.

7
IMPORTANT SAFETY INSTRUCTIONS FOR USE OF THE
CORDLESS HAMMER DRILL
WARNING: Death or serious bodily injury could result from improper or unsafe use
of the cordless hammer drill. To avoid these risks, follow these basic
safety instructions:
1. Never place hands or other body parts near the drill bit or chuck during operation. Hold
the drill by its handle only.
2. Because the cordless hammer drill operates by battery power, be aware of the fact that
it can begin to operate at any time.
3. Wear eye and ear protection at all times.
4. When working at elevated locations, clear the area of all other people and be aware of
conditions below you.
IMPORTANT SAFETY INSTRUCTIONS FOR BATTERY CHARGER
1. This manual contains important safety and operating instructions for battery charger
Model UC12Y, UC14YF and UC14YF2.
2. Before using battery charger, read all instructions and cautionary markings on (1) battery
charger, (2) battery, and (3) product using battery.
3. < UC12Y >
To reduce risk of injury, charge HITACHI rechargeable battery type EB7, EB9, EB12, EB2,
B-2, B-3 or B-4. Other type of batteries may burst causing personal injury and damage.
< UC14YF / UC14YF2 >
To reduce risk of injury, charge HITACHI rechargeable battery type EB7, EB9, EB12, EB14
series. Other type of batteries may burst causing personal injury and damage.
4. Do not expose battery charger to rain or snow.
5. Use of an attachment not recommended or sold by the battery charger manufacturer may
result in a risk of fire, electric shock, or injury to persons.
6. To reduce risk of damage to electric plug and cord, pull by plug when disconnecting
battery charger.
7. Make sure cord is located so that it will not be stepped on, tripped over, or otherwise
subjected to damage or stress.
8. An extension cord should not be used unless absolutely necessary. Use of improper
extension cord could result in a risk of fire and electric shock.
If extension cord must be used make sure:
a. That blades of extension cord are the same number, size, and shape as those of
plug on battery charger:
b. That extension cord is properly wired and in good electrical condition; and
c. That wire size is large enough for AC ampere rating of battery charger as specified
in Table 1.

8
Table 1
RECOMMENDED MINIMUM AWG SIZE FOR
EXTENSION CORDS FOR BATTERY CHARGERS
AC Input Rating Amperes* AWG Size of Cord
Equal to or but less Length of Cord, Feet (Meter)
greater than than 25 (7.5) 50 (15) 100 (30) 150 (45)
0 2 18 18 18 16
2 3 18 18 16 14
3 4 18 18 16 14
1250watts
125 volts = 10 amperes
* If the input rating of a battery charger is given in watts rather than in amperes, the
corresponding ampere rating is to be determined by dividing the wattage rating by the
voltage rating-for example:
9. Do not operate battery charger with damaged cord or plug-replace them immediately.
10. Do not operate battery charger if it has received a sharp blow, been dropped, or
otherwise damaged in any way; take it to a qualified serviceman.
11. Do not disassemble battery charger; take it to a qualified serviceman when service or
repair is required. Incorrect reassembly may result in a risk of electric shock or fire.
12. To reduce risk of electric shock, unplug charger from receptacle before attempting any
maintenance or cleaning. Removing the battery will not reduce this risk.
IMPORTANT SAFETY INSTRUCTIONS FOR USE OF THE BATTERY
AND BATTERY CHARGER
You must charge the battery before you can use the cordless driver drill. Before using the
model UC12Y, UC14YF and UC14YF2 battery chargers, be sure to read all instructions and
cautionary statements on it, the battery and in this manual.
REMEMBER:
< UC12Y >
USE ONLY HITACHI BATTERY TYPE EB7, EB9, EB12, EB2, B-2, B-3 OR B-4.
OTHER TYPES OF BATTERIES MAY BURST AND CAUSE INJURY!
< UC14YF / UC14YF2 >
USE ONLY HITACHI BATTERY TYPES EB7 SERIES, EB9 SERIES, EB12 SERIES, EB14 SERIES.
OTHER TYPES OF BATTERIES MAY BURST AND CAUSE INJURY!
Follow these instructions to avoid the risk of injury:
WARNING: Improper use of the battery or battery charger can lead to serious injury.
To avoid these injuries:

9
1. NEVER disassemble the battery.
2. NEVER incinerate the battery, even if it is damaged or is completely worn out. The
battery can explode in a fire.
3. NEVER short-circuit the battery.
4. NEVER insert any objects into the battery charger’s air vents. Electric shock or damage
to the battery charger may result.
5. NEVER charge outdoors. Keep the battery away from direct sunlight and use only
where there is low humidity and good ventilation.
6. < UC12Y >
NEVER charge when the temperature is below 41°F (5°C) or above 104°F (40°C).
< UC14YF / UC14YF2 >
NEVER charge when the temperature is below 32°F (0°C) or above 104°F (40°C).
7. NEVER connect two battery chargers together.
8. NEVER insert foreign objects into the hole for the battery or the battery charger.
9. NEVER use a booster transformer when charging.
10. NEVER use an engine generator or DC power to charge.
11. NEVER store the battery or battery charger in places where the temperature may reach
or exceed 104°F (40°C).
12. ALWAYS operate charger on standard household electrical power (120 volts). Using
the charger on any other voltage may overheat and damage the charger.
13. ALWAYS wait at least 15 minutes between charges to avoid overheating the charger.
14. ALWAYS disconnect the power cord from its receptacle when the charger is not in use.
DISPOSAL OF THE EXHAUSTED BATTERY
WARNING: Do not dispose of the exhausted battery. The battery must explode if it
is incinerated. The product that you have purchased contains a re-
chargeable battery. The battery is recyclable. At the end of it’s useful
life, under various state and local laws, it may be illegal to dispose of this
battery into the municipal waste stream. Check with your local solid
waste officials for details in your area for recycling options or proper
disposal.
SAVE THESE INSTRUCTIONS
AND
MAKE THEM AVAILABLE TO
OTHER USERS OF THIS TOOL!

10
䡬Battery (EB12, EB12B)
Indication Chuck Wrench
Fig. 1
Indication
Body
Lock button
Shift Knob
Nameplate
Latch
Terminal Hole
Nameplate
Switch
Trigger Right and Left
Turn Lever
Hook
Drill Chuck
Change Lever
Switch Lock
Battery
OPERATION AND MAINTENANCE
NOTE: The information contained in this Instruction Manual is designed to assist you in the
safe operation and maintenance of the power tool.
Some illustrations in this Instruction Manual may show details or attachments that
differ from those on your own power tool.
MODEL
DV10DA (1HCK), DV10DV (1HCK): with battery charger (UC12Y) and case
DV10DV (BFK): with battery charger (UC14YF or UC14YF2) and case
NAME OF PARTS
1. Cordless Hammer Drill (DV10DA and DV10DV)

11
MODEL UC12Y UC14YF / UC14YF2
Input power source Single phase: AC 120V 60 Hz
Charging time EB12 ....... Approx. 60 min. EB12 .......... Approx. 45 min.
(At a temperature of 68°F (20°C)) EB12B ........ Approx. 60 min.
Charging voltage DC 2.4 –12V DC7.2 –14.4V
Charging current DC 1.3A DC 1.9A
Weight 2.9 lbs. (1.3 kg) 2.9 lbs. (1.3 kg)
Model DV10DA (Two speed) DV10DV (Variable speed)
Motor DC Motor
No-load speed Low speed 750 rpm Low speed 0 - 750 rpm
High speed 1500 rpm High speed 0 - 1500 rpm
Capacity Drilling
Brick ........................................................ 3/8'’(10 mm)
Metal .......... 3/8'’(10mm) (Mild Steel or Aluminum)
Wood ............................. 19/32'’(15mm) (Soft Wood)
Screw Driver
Wood screw ...................... #10 ⳯1'’(4.8mm ⳯25mm)
(Soft Wood)
Drill chuck capacity Maximum gripping diameter 3/8'’(10mm)
Battery (EB12, EB12B) Nickel cadmium battery
Voltage .............................................................................. DC12V
Charging & discharging frequency
UC12Y ............................ about 500
UC14YF / UC14YF2 ..... about 1000
Weight 4.4 Ibs (2.0 kg) 4.6 lbs (2.1 kg)
2. Battery Charger
2. Battery Charger
Body
Cord
Battery Installa-
tion Hole
Nameplate
Pilot Lamp
< UC12Y > < UC14YF / UC14YF2 >
Fig. 2
SPECIFICATIONS
1. Cordless Hammer Drill (DV10DA and DV10DV)
Pilot Lamp
Cord
Battery Installation Hole
Caution
Plate
Body
Nameplate

12
ACCESSORIES
WARNING: Accessories for this power tool are mentioned in this Instruction
Manual.
The use of any other attachment or accessory can be dangerous and
could cause injury or mechanical damage.
STANDARD ACCESSORIES
DV10DA (1HCK)
DV10DV (1HCK)
1Battery Charger (UC12Y) ................................................... 1
2Chuck wrench (set at the body) ........................................ 1
(Code No.980057)
3Battery (EB12) (attached to body) .................................... 1
4Plastic Case (Code No.303346) ......................................... 1
DV10DV (BFK)
1Battery Charger (UC14YF or UC14YF2) ........................... 1
2Chuck wrench (set at the body) ........................................ 1
(Code No.980057)
3Battery (EB12B) (attached to body) .................................. 1
4Plastic Case (Code No.303346) ......................................... 1
OPTIONAL ACCESSORIES.....sold separately
1. Battery (EB12, EB12B)
Fig. 4
1
2
34
1
2
34

13
2. Drill Bit for brick
Diameter ............. 1/4'’(6.35 mm), 5/16'’(8 mm), 0.37'’(9.5 mm), 3/8'’(10 mm)
3. Drill Bit for steel
Diameter ............................. 5/64'’(2 mm), 13/64'’(5 mm), 15/64'’(6 mm)
4. Drill Bit for wood
Diameter .......................................................... 3/8'’(10 mm), 1/2'’(13 mm)
5. Plus driver bit
Bit No. .......................................................................................... No.1, No.2
NOTE:
Accessories are subject to change without any obligation on the part of the HITACHI.
APPLICATIONS
䡬For drilling brick, etc. and for making base holes for pugs, anchors, etc.
䡬For drilling wood, metal, plastic, etc.
䡬For driving and removing of wood screws, tapping screws etc.
REMOVAL AND INSTALLATION METHOD OF BATTERY
CAUTION:
l To prevent the accident, be sure that the switch has been locked.
Bit No.
Fig. 5
䡬How to remove the battery.
Hold the handle tight.
Press the latch located at the front of the battery
and pull out the battery. (Fig. 6)
䡬How to install the battery.
Position the battery so that the latch faces toward
the switch trigger in the handle and insert the
battery. (Fig. 6)
Handle
Battery
Push
Latch
Insert
Pull Out
Fig. 6

14
CHARGING METHOD
Battery
Nameplate
Pilot Lamp
Ventilation Slots
< UC12Y >
< UC14YF / UC14YF2 >
Fig. 7
NOTE:
Before plugging into the receptacle, make sure the
following points.
䡬The power source voltage is stated on the name-
plate.
䡬The cord is not damaged.
WARNING:
Do not charge at voltage higher than indicated
on the nameplate.
If charged at voltage higher than indicated on
the nameplate, the charger will burn up.
1. Insert the plug of battery charger into the
receptacle.
When the plug of battery charger has been in-
serted into the receptacle, pilot lamp will blink in
red. (At 1-second intervals.)
Battery
Nameplate
WARNING: Do not use the electrical cord if
damaged.
Have it repaired immediately.
2. Insert the battery to the battery charger.
Insert the battery into the battery charger as
shown in Fig. 7.
Make sure it contacts the bottom of the battery
charger.
3. Charging
䡬When the battery is connected to the battery
charger, charging will commence and the
pilot lamp will light in red. (See Table 2)
NOTE: If the pilot lamp does not light, pull
out the plug from the receptacle and
check if the battery is properly
mounted.
䡬When the battery is fully charged, the pilot
lamp will blink in red slowly. (At 1-second
intervals) (See Table 2)
Pilot Lamp

15
(1) Pilot lamp indication
The indications of the pilot lamp will be as shown in Table 2, according to the condition
of the charger or the rechargeable battery.
(2) Regarding the temperature of the rechargeable battery.
The temperatures for rechargeable batteries are as shown in the table below, and
batteries that have become hot should be cooled for a while before being recharged.
(3) Regarding recharging time (At 68°F (20°C))
Depending on the combination of the charger and batteries, the charging time will
become as shown in Table 4.
NOTE: The charging time may vary according to temperature and power source voltage.
Table 2
Indications of the pilot lamp
Lights for 0.5 seconds. Does not light for
0.5 seconds. (off for 0.5 seconds)
Lights continuously
Lights for 0.5 seconds. Does not light for
0.5 seconds. (off for 0.5 seconds)
Lights for 0.1 seconds. Does not light for
0.1 seconds. (off for 0.1 seconds)
■■■■■■■■■■■■
Lights continuously
Malfunction in the
battery or the charger
The battery temperature
is high, making recharg-
ing impossible.
Before
charging
While
charging
Charging
completed
Charging
impossible
Charging
impossible
(UC14YF / UC14YF2 only)
Blinks
(RED)
Lights
(RED)
Blinks
(RED)
Flickers
(RED)
Lights
(GREEN)
Table 3 Recharging of batteries that have become hot
Temperatures at which the battery can be recharged
23°F —104°F (–5°C —40°C)
23°F —140°F (–5°C —60°C)
Table 4
Battery Charger UC12Y UC14YF/UC14F2
EB 12 Approx. 60 min. Approx. 45 min.
EB 12B —————— Approx. 60 min.
Rechargeable batteries
EB 12
EB 12B

16
4. Disconnect battery charger from the receptacle.
CAUTION:
Do not pull the plug out of the receptacle by pulling on the cord.
Make sure to grasp the plug when removing from receptacle to avoid damaging cord.
5. Remove the battery from the battery charger.
Supporting the battery charger with hand, pull out the battery from the battery charger.
CAUTION:
●When the battery charger has been continuously used, the battery charger will heated,
thus constituting the cause of the failures. Once the charging has been cmpleted, give
15 minutes rest until the next charging.
●If the battery is recharged when it is warm due to battery use or exposure to sunlight,
the pilot lamp may light in green.
The battery will not be recharged. In such a case, let the battery cool before charging.
●When the pilot lamp flickers rapidly in red (at 0.2–second intervals), check for and take
out any foreign objects in the charger’s battery installation hole. If there are no foreign
objects, it is probable that the battery or charger is malfunctioning. Take it to your
authorized Service Agent.
Regarding electric discharge in case of new batteries, etc.
As the internal chemical substance of new batteries and batteries that have not been used
for an extended period is not activated, the electric discharge might be low when using
them the first and second time. This is a temporary phenomenon, and normal time
required for recharging will be restored by recharging the batteries 2 –3 times.
How to make the batteries perform longer.
(1) Recharge the batteries before they become completely exhausted.
When you feel that the power of the tool becomes weaker, stop using the tool and
recharge its battery. If you continue to use the tool and exhaust the electric current, the
battery may be damaged and its life will become shorter.
(2) Avoid recharging at high temperatures.
A rechargeable battery will be hot immediately after use. If such a battery is recharged
immediately after use, its internal chemical substance will deteriorate, and the battery life
will be shortened. Leave the battery and recharge it after it has cooled for a while.

17
BEFORE USE
1. Arrange and check the working place.
Check whether the working place is in a proper condition as mentioned in the notes.
2. Attach a bit.
CAUTION: Before attaching a bit, confirm that the switch is locked.
When the attaching a drill or a driver bit to the drill chuck, always use the chuck wrench
and fasten it firmly. There are 3 holes where the wrench is used. Do not fasten tightly only
at one hole. Fasten uniformly at 3 holes successively.
NOTE:
䡬The chuck wrench is attached at the cen-
ter of the body. To remove it, lift it in the
direction of the arrow. After use, attach it
securely in the original position. (Fig. 8)
䡬When installing the driver bit, always
place the driver bit so that the driver bit
flat surface comes into contact with the
chuck claw and fully tighten the chuck
wrench.
3. Check the attachment of the battery.
4. Check the direction of rotation.
If the lever of the switch unit is set to the
side, the tool will turn right when
viewed from the rear. If the lever is set to
the side, it will turn left. (Fig. 1, Fig. 9)
and are indicated on the outer
frame).
CAUTION:
●During operation, the lever cannot
be changed. To change the lever,
always turn off the switch then
change the lever.
Chuck Wrench
Right and Left
Turn Lever
Fig. 9
Side
Fig. 8
Side

18
5. IMPACT to ROTATION change-over
(Fig. 10)
The Hammer Drill can be switched from
IMPACT (impact plus rotation) to ROTA-
TION (rotation only) by sliding the change
lever. When boring brick or similar hard
materials, sliding the change lever to
IMPACT side. The drill head impacts
against the material while continuing to
rotate.
When boring metal, wood or plastic or
tightening the screw, sliding the change
lever to ROTATION side. The drill rotates
as an ordinary drill.
CAUTION:
Do not use the Hammer Drill in the IMPACT function if the material can be bored by
rotation only. Such action will not only reduce drill efficiency, but may also damage the
drill tip.
6. High speed-Low speed changeover
Operate the shift knob to change the rotatinoal speed. Depress the lock button to release
the lock and move the shift knob in the direction of the arrow (Fig. 11) When the shift knob
is set to “LOW”, the drill rotates at a low speed. When set too“HIGH”, the drill rotates at
a high speed. If the shift knob cannot be moved smoothly, clasp the drill chuck by hand
and rotate the spindle slightly.
Change Lever
ROTATION
ROTATION + IMPACT
Fig. 10
CAUTION:
●In case you change the speed, always turn off the switch and confirm the switch is
locked.
To change the speed while the motor is running will damage the inner gear.
●To ensure the engagement of the gear, push the shift knob to the end. (Fig. 11)
Fig. 11
Shift Knob
Low Speed Side
Low Speed
High Speed Side Shift Knob
High Speed

19
7. Continuous drilling
When drilling brick, refer to Table 5.
Table 5 Depth: 1-1/8" (30mm)
CAUTION:
●When drilling brick continuously, the number of holes to be drilled should be less
than specified in Table 5.
●When the hammer drill is used continuously, the body may be heated. If this
happens, leave the hammer drill to cool.
●If the hammer drill is used continuously to drill more holes than specified in Table
5, the motor will be burnt.
OPERATION
CAUTION:
●While operating the hammer drill, take care not to lock the motor.
●If the motor is locked, immediately turn the power off. If the motor is locked for a
while, the motor or battery may be burnt.
1. Switch lock and switch
Bit Diameter
1/4" (6.35 mm) 5/16" (8 mm) 3/8" (10 mm)
Possible continuous 20 holes 15 holes 10 holes
drilling number
Locking Direction
Lock Releasing
Direction
Switch
Switch
Lock
Fig. 12
䡬To operate this tool, first release the
switch lock. (Fig. 12)
䡬When the trigger of the switch is pulled,
the tool rotates.
When the trigger is let loose, the tool
stops.
䡬The rotational speed of the drill can be
controlled by varying the amount that
the trigger switch is pulled.
Speed is low when the trigger switch is
pulled slightly and increases as the switch
is pulled more. (DV10DV only)

20
䡬After use, always lock the switch. (Fig. 12) This prevents this tool from rotating
unexpectedly.
NOTE:
䡬The rotational speed of Model DV10DA can not be controlled by pulling the switch trigger.
䡬A buzzing noise is produced when the motor is about to rotate; this is only a noise, not
a machine failure. (DV10DV only)
2. For drilling brick
䡬Always set the lever of the switch to “R”. If the lever is set too “L”, a hole cannot be
made. (Fig. 1, Fig. 9)
䡬Drive the hammer drill by 20 –30 lbs. (10 –15 kg) force. Excessive force never
increases drilling speed and it will not only damage the drill tip and reduce work
efficiency, but also shorten the drill service life.
MAINTENANCE AND INSPECTION
CAUTION: Pull out battery before doing any inspection or maintenance.
1. Checking the condition of the bit.
The bits should be checked regularly. If worn or broken bits can slip or decrease the
efficiency of the motor and burn it out.
Replace worn bits with new ones.
CAUTION: If you use a driver bit of which point is worn or broken, it will be dangerous
since it slips. So replace it with a new one.
2. Check the Mounting Screws
Loose mounting screws are dangerous. Regularly inspect them and make sure they are
tight.
CAUTION: Using this power tool with loosen, screws is extremely dangerous.
3. Check for Dust
Dust may be removed with a soft cloth or a cloth dampened with soapy water.
Do not use bleach, chlorine, gasoline or thinner, for they may damage the plastics.